diff options
Diffstat (limited to 'builtin.c')
| -rw-r--r-- | builtin.c | 9 |
1 files changed, 6 insertions, 3 deletions
@@ -42,10 +42,13 @@ /* The extra casts work around common compiler bugs. */ #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) -/* The outer cast is needed to work around a bug in Cray C 5.0.3.0. - It is necessary at least when t == time_t. */ +/* Note: these assume that negative integers are represented internally + via 2's complement, which is not mandated by C. They also ignore the + fact that signed integer arithmetic overflow can trigger exceptions, + unlike unsigned which is guaranteed not to do so. */ #define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \ - ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0)) + ? ~ (uintmax_t) 0 << (sizeof (t) * CHAR_BIT - 1) \ + : 0)) #define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t))) #ifndef INTMAX_MIN |